Brush-holder.



Patented Oct. 13

ms a'iarnvav v nanny HEATH,

.tno i-ieoohso.

To all' whom it may concern:

Be it known that IIQ'HARRY E. HEATH, a

citizen the" United States. residing at- H I Lynn. county of Essex, State of Massachu sett sf have invented certain new and useful I-mptovements: in Brush-Holders of which.

the following is a specification.

' The objectof my present inv'entionis the production ofanimproved form, of brush-- holder for dynamo electrlc machines.

Q =My inventio'n consists among other things in' an advantageous arrangement and construction' of the parts composing the brush-1 holder whereby the brush can readily accommodate itself to any inequalities, or ir-' regularities in the commutator or collectorring surface against which it bears'without objectionable circumferential or tangential movement of the brush face.

For a better understanding of. my invention reference may be had to the accompanying drawings in which I have illustrated various forms of my invention;

I Of the drawings Figure 1 is a sectional eleyation taken on the line 22 of Fig. 2, and

' 2 is a plan View illustrating one form of my inventionlz Fig. 3 is a. sectional eleva'tiointaken similarly to Fig. 1; illustrat' ing "a slightly modified "form" of my invention; Fig.4 is a sectional elevation taken on the line 4 4; of: igm5, and Fig. 5 is a plan iew illustrating a third-formof my inven-- tion Fig. 6 is. a plan view and Fig. 7 is a sectional elevation taken on the lines 7 7 of Fig. 6 -illustrati-ng\a fourth form of my inventi'on; and Fig. 8 is a perspective view of a detail employed in connection with certain forms of myinv'ention. i

In all. the drawings 1. represents the stud or post upon which the brush holder is mounted; 2 represents the brush,- 3 represents the surface of a member which may be a" commutator or collector ring against which the brush 2bears, and the line 3 represents'the element of the surface?) midway between the front and back edges of the brush, v

In the former my invention shown in Fig. l the brush 2 is placed in a socketed boxlike frame 4; having curved shoulders or wings 5 formed on opposite sides. The

upper-end of the frame 4 passes through an aperture formed for the purpose in a. member 6 which is loosely mounted on the stud 1. The member (3 1s. formed with grooves T I i v Specification of Letters Patent.

Application filed-April '7, 1904. Serial No. 201,963.

PATENT OFFICE.

BRUSH-HOLDER.

Patented Oct. 13, 1908 in which anti -fi'iction rolls-S are placed:

These rolls are mounted. on 'pintles 9. As is clearly shown in the drawing. the outer surfaces of the cam wings 5 abut against the rolls 8. An arm 1 adjustably clamped to the stud 1. is employed to regulate the force with'which a spring 12 extending between it and the top of the member 6 presses the brush 2 against the comn'iutator surface 3. The portion of the outer surface of the curved wings 5 which engages the rolls 8 is cylindrical about the line 3" as an axis. and therolls S are all tangential'to the cylindrical surface of the wings 5. As the brush wears away it. may be forced out of the socket, in the frame t by means of a pair. of screws 13 which press against a follower 14' resting against the unper end ofthe brush. Pins 15 projecting from the ends of the. frame t through arc-shaped slots 15' in'the. end walls of the member 6 may be employed to prevent the parts from becoming disassembled.

\Vith the construction shown .in Figs. 1 and 2 it'will be observed that the brush is yieldi'ngly pressed against the commutator by means of the spring 12 and at the-sametime is 'free to rock about the line 3, as the anti-friction rolls 8 offer but little if any opposition to the oscillation of the frame 4. The brush can thus accommodate itself to deviations from the cylindrical of the surface The-rocking movement of the brush will not produce a circumferential or tangential movement of the brush face about the cylindrical surface 3. however. since the axis of oscillation of the brush is substantially coincident with an element of the brush face and an element of the surface 3. This may be highly important. particularly where the cylindrical member 3 a commutator, since the movement of the brush necessary'to acconnnodate itself to irregularities in the commutator surface will not.vary'th e axis of commutation. If the frame at and member Gare moved from the position shown in Fig. l to compensate for the wear of the brush some change in position of the axis of oscillation of the brush will be produced. The

In the form of my invention shown in Fig 3 the frame 6 isadjustably clamped to the stud 1 and the arm ,10 and spring 12 are dispensed WithJ The spring tension on the "brush is obtained by the use of a bowed g spring'lG (see Fig.8); This-spring is placed in the box 'with its ends. resting against the brush. A single regulating screw-13,

located midway between the ends of. the frame 4, is employed to regulate thetension onthe brush. Bymaking the brush of a :width somewhat less than the-width of the socket in the member 4: the brush is free to move parallel to the axis of the commutator and can rock not only about an element of r the cylindrical surface 3, but also in a plane the frame 1. Except as indicated above the construction shown in Fig. 3 may be identical with that shown inFigs. 1 and 2.

In the construction shown in Figs. 1 and 5, a frame 4} is employed which is pivotally connected by a pair of link members 1'2 to apair of arms 18 which are loosely mounted on the stud 1. In this form of my invention the upper surface of the frame 1' is cylindrical about the line 8" as an axis. A split collar 19 adjustably secured to the stud 1 is provided with a pair of curved arms 20, in the outer end of each of which is mounted an. anti-friction roll 21. As is clearly showh in Fig. 4; the r0112]. engages the upper curved surface of the frame 4;. In this construction theparts are so proportioned that the plane so passing through the center of the stud 1 and the line 3 is parallel to each of the links 17, while the center of the stud 1 and the pivotal. centers of theleft hand ends of the bars 17, as seen in Fig. {1, are in a plane which is parallel to the plane containing the pivotal centers of the right hand ends of the bar 17 and the line 3. With this construction also the brush 2 is perfectly free to rock about the line 3? but the face of the brush is prevented from. moving circumferentially around the surface 3. In this form of my invention the brush is .yieldingly supported in the frame t, by the spring 16. The construction shown in Figs. 6 and 7 l differs from that shown in Figs. 1 and niiicipallynn the fact that the brush is rigidly clamped against theframe i. In this form of my invention a single arm-20' loosely mounted on the stud 1, and carrying an anti-friction roll 21 at its outer end, serves to hold the brush against the commutator. The arm 20" is embraced at intermediate ends by a spring 22. This spring is secured to a split collar 23 adjustably mounted on the stud 1.

VVhile I have described and illustrated somewhat in detail several embodiments of my invention, it will be readily understood by all those ski led in the art that many changes may be made in the form of my invention without departing from its spirit.

lVhat I claim as new and desire to secure by Letters Patent of the United States, is:

1. In combination, a cylindrical surface, a brush engaging said surface, and a supporting frame for the brush free to rock about an element of said surface as-an axis.

2. In a brush holder,'a brush having a curved surface, and a frame for support-mg the brush free to rock about an element of said surface as an axis.

3. In'combination. a cylindrical surface, a brush engaging said surface, and a frame for supporting the b1 ush free to rock about an axis substantially coincident with an element of said surface.

4. In combination, a cylindrical surface, a brush holder, and a brush supporting frame pivoted to rock about an axis substantially coincident with an element of said surface.

5. In a brush holder, a brush and a supporting frame therefor free to rock about an axis substantially coincident with a line in the face of said brush.

6. In combination, a cylindrical-commutator, and a brush holder comprising a brush supporting frame pivoted to rock about an element of the surface of said commutator as an axis.

7. In combination, a cylindrical surface, a brush engaging said surface, and a holder for the brush, said holder comprising a frame for supporting the brush pivoted to rock about an element of said surface as an axis.

In witness whereof I have hereunto set my hand this fourth day of April, 1904:.

HARRY E. HEATH. 

